28390244 has 12 divisors (see below), whose sum is σ = 49745724. Its totient is φ = 14177184.

The previous prime is 28390223. The next prime is 28390247. The reversal of 28390244 is 44209382.

It can be written as a sum of positive squares in 2 ways, for example, as 18593344 + 9796900 = 4312^2 + 3130^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28390244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539 + ... + 7554.

It is an arithmetic number, because the mean of its divisors is an integer number (4145477).

Almost surely, 2^28390244 is an apocalyptic number.

It is an amenable number.

28390244 is a deficient number, since it is larger than the sum of its proper divisors (21355480).

28390244 is a wasteful number, since it uses less digits than its factorization.

28390244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8974 (or 8972 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28390244 is about 5328.2496187773. The cubic root of 28390244 is about 305.0631205024.

The spelling of 28390244 in words is "twenty-eight million, three hundred ninety thousand, two hundred forty-four".